Maria Cristina is a station in the Barcelona Metro and Trambaix networks, in the Les Corts district of Barcelona. It is served by metro line L3 and tram lines T1, T2 and T3.The metro station is located under Avinguda Diagonal, between Carrer del Doctor Ferran and Gran Via de Carles III. It has two 94m long side platforms. The tram station is located in the Avinguda Diagonal, immediately above the metro station. Both stations lie in front of the La Caixa headquarters in La Maternitat i Sant Ramon.The metro station opened in 1975, along with the other stations of the section of L3 between Zona Universitària and Sants Estació stations. This section was originally operated separately from L3, and known as L3b, until the two sections were joined in 1982. The tram station was inaugurated in 2004, the year regular Trambaix service started.